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United States Patent | 5,706,057 |
Strolle ,   et al. | January 6, 1998 |
A television signal receiver for processing an HDTV signal transmitted in a vestigial sideband (VSB) format with a one-dimensional data constellation includes a first carrier recovery network (18), an equalizer (20), and a second carrier recovery network (22, 30, 62). A multiple stage quantizer network (50, 66) exhibiting progressively finer resolution is associated with the operation of the equalizer for providing blind equalization without need of a "training" signal. The second carrier recovery network includes a phase detector (30) wherein a one-symbol delayed (312) input signal and a quantized (310) input signal are multiplied (316), and an unquantized input signal and a quantized (310) one-symbol delayed (314) input signal are multiplied (316), and an unquantized input signal and a quantized (310) one-symbol delayed (314) input signal are multiplied (318). Signals produced by the multiplication are subtractively combined (320) to produce an output signal representing carrier phase error.
Inventors: | Strolle; Christopher Hugh (Glenside, PA); Jaffe; Steven Todd (Freehold, NJ) |
Assignee: | RCA Thomson Licensing Corporation (Princeton, NJ) |
Appl. No.: | 704788 |
Filed: | September 5, 1996 |
PCT Filed: | March 13, 1995 |
PCT NO: | PCT/US95/03133 |
371 Date: | September 5, 1996 |
102(e) Date: | September 5, 1996 |
PCT PUB.NO.: | WO95/26105 |
PCT PUB. Date: | September 28, 1995 |
Mar 21, 1994[GB] | 9405487 |
Current U.S. Class: | 375/240.01; 348/470; 348/537; 348/725; 375/326 |
Intern'l Class: | H04N 007/04 |
Field of Search: | 348/426,469,470,471,512,518,536,537,725,726,731,735 375/270,321,326,327 329/357 455/204,203,47 |
3795865 | Mar., 1974 | Armstrong | 375/270. |
5170415 | Dec., 1992 | Yoshida et al. | 375/80. |
5228060 | Jul., 1993 | Uchiyama | 375/75. |
5386239 | Jan., 1995 | Wang et al. | 348/472. |
5410573 | Apr., 1995 | Taga et al. | 375/376. |
5588025 | Dec., 1996 | Strolle et al. | 375/316. |
Mueller and Muller, Timing Recovery in Digital Synchronous Data Receivers, IEEE Transactions on Communications, May 1976, pp. 516-531. The Grand Alliance HDTV System Specification (Draft Document) submitted to the ACATS Technical Subgroup, as published in the 1994 Proceedings of the 48th Annual Broadcase Engineering Conf. Proceedings Mar. 20-24, 1994. Davis et al., "Pseudo-Coherent Phase Shift Keyed Demodulator," ICASSP '89: Acoustics, Speed & Signal Processing Conference, pp. 1388-1391, Feb. 1989. Kuan et al, "An Adaptive Notch-Filter-Based Frequency-Difference Detector and Its Applications", IEEE Transactions on Communications, vol. 43, No. 11, pp. 2784-2793, Nov. 1995. Kempez, "A Comparison of QAM and VSB for Hybrid Fiber/Coax Digital Transmission", IEEE Transactions on Broadcasting, vol. 41, No. 1, pp. 9-16, Mar. 1995. |